2 * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * RSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
16 #include <openssl/crypto.h>
17 #include <openssl/evp.h>
18 #include <openssl/core_numbers.h>
19 #include <openssl/core_names.h>
20 #include <openssl/rsa.h>
21 #include <openssl/params.h>
22 #include <openssl/err.h>
23 /* Just for SSL_MAX_MASTER_KEY_LENGTH */
24 #include <openssl/ssl.h>
25 #include "internal/constant_time.h"
26 #include "internal/sizes.h"
27 #include "crypto/rsa.h"
28 #include "prov/providercommonerr.h"
29 #include "prov/provider_ctx.h"
30 #include "prov/implementations.h"
34 static OSSL_OP_asym_cipher_newctx_fn rsa_newctx;
35 static OSSL_OP_asym_cipher_encrypt_init_fn rsa_init;
36 static OSSL_OP_asym_cipher_encrypt_fn rsa_encrypt;
37 static OSSL_OP_asym_cipher_decrypt_init_fn rsa_init;
38 static OSSL_OP_asym_cipher_decrypt_fn rsa_decrypt;
39 static OSSL_OP_asym_cipher_freectx_fn rsa_freectx;
40 static OSSL_OP_asym_cipher_dupctx_fn rsa_dupctx;
41 static OSSL_OP_asym_cipher_get_ctx_params_fn rsa_get_ctx_params;
42 static OSSL_OP_asym_cipher_gettable_ctx_params_fn rsa_gettable_ctx_params;
43 static OSSL_OP_asym_cipher_set_ctx_params_fn rsa_set_ctx_params;
44 static OSSL_OP_asym_cipher_settable_ctx_params_fn rsa_settable_ctx_params;
46 static OSSL_ITEM padding_item[] = {
47 { RSA_PKCS1_PADDING, OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
48 { RSA_SSLV23_PADDING, OSSL_PKEY_RSA_PAD_MODE_SSLV23 },
49 { RSA_NO_PADDING, OSSL_PKEY_RSA_PAD_MODE_NONE },
50 { RSA_PKCS1_OAEP_PADDING, OSSL_PKEY_RSA_PAD_MODE_OAEP }, /* Correct spelling first */
51 { RSA_PKCS1_OAEP_PADDING, "oeap" },
52 { RSA_X931_PADDING, OSSL_PKEY_RSA_PAD_MODE_X931 },
57 * What's passed as an actual key is defined by the KEYMGMT interface.
58 * We happen to know that our KEYMGMT simply passes RSA structures, so
59 * we use that here too.
66 /* OAEP message digest */
68 /* message digest for MGF1 */
71 unsigned char *oaep_label;
74 unsigned int client_version;
75 unsigned int alt_version;
78 static void *rsa_newctx(void *provctx)
80 PROV_RSA_CTX *prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
84 prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
89 static int rsa_init(void *vprsactx, void *vrsa)
91 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
93 if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
95 RSA_free(prsactx->rsa);
98 switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
99 case RSA_FLAG_TYPE_RSA:
100 prsactx->pad_mode = RSA_PKCS1_PADDING;
103 ERR_raise(ERR_LIB_PROV, PROV_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
110 static int rsa_encrypt(void *vprsactx, unsigned char *out, size_t *outlen,
111 size_t outsize, const unsigned char *in, size_t inlen)
113 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
117 size_t len = RSA_size(prsactx->rsa);
120 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
127 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
128 int rsasize = RSA_size(prsactx->rsa);
131 if ((tbuf = OPENSSL_malloc(rsasize)) == NULL) {
132 PROVerr(0, ERR_R_MALLOC_FAILURE);
135 if (prsactx->oaep_md == NULL) {
137 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
138 PROVerr(0, ERR_R_INTERNAL_ERROR);
141 ret = RSA_padding_add_PKCS1_OAEP_mgf1(tbuf, rsasize, in, inlen,
143 prsactx->oaep_labellen,
151 ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
155 ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
158 /* A ret value of 0 is not an error */
165 static int rsa_decrypt(void *vprsactx, unsigned char *out, size_t *outlen,
166 size_t outsize, const unsigned char *in, size_t inlen)
168 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
170 size_t len = RSA_size(prsactx->rsa);
172 if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
174 *outlen = SSL_MAX_MASTER_KEY_LENGTH;
177 if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
178 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
184 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
192 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
197 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
198 || prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
201 if ((tbuf = OPENSSL_malloc(len)) == NULL) {
202 PROVerr(0, ERR_R_MALLOC_FAILURE);
205 ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
208 * With no padding then, on success ret should be len, otherwise an
209 * error occurred (non-constant time)
211 if (ret != (int)len) {
213 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
216 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
217 if (prsactx->oaep_md == NULL) {
218 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
219 if (prsactx->oaep_md == NULL) {
220 PROVerr(0, ERR_R_INTERNAL_ERROR);
224 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
227 prsactx->oaep_labellen,
231 /* RSA_PKCS1_WITH_TLS_PADDING */
232 if (prsactx->client_version <= 0) {
233 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
236 ret = rsa_padding_check_PKCS1_type_2_TLS(prsactx->libctx, out,
239 prsactx->client_version,
240 prsactx->alt_version);
244 ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa,
247 *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
248 ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
252 static void rsa_freectx(void *vprsactx)
254 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
256 RSA_free(prsactx->rsa);
258 EVP_MD_free(prsactx->oaep_md);
259 EVP_MD_free(prsactx->mgf1_md);
261 OPENSSL_free(prsactx);
264 static void *rsa_dupctx(void *vprsactx)
266 PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
267 PROV_RSA_CTX *dstctx;
269 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
274 if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
275 OPENSSL_free(dstctx);
279 if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
280 RSA_free(dstctx->rsa);
281 OPENSSL_free(dstctx);
285 if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
286 RSA_free(dstctx->rsa);
287 EVP_MD_free(dstctx->oaep_md);
288 OPENSSL_free(dstctx);
295 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
297 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
300 if (prsactx == NULL || params == NULL)
303 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
305 switch (p->data_type) {
306 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
307 if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
310 case OSSL_PARAM_UTF8_STRING:
313 const char *word = NULL;
315 for (i = 0; padding_item[i].id != 0; i++) {
316 if (prsactx->pad_mode == (int)padding_item[i].id) {
317 word = padding_item[i].ptr;
323 if (!OSSL_PARAM_set_utf8_string(p, word))
326 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
334 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
335 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
337 : EVP_MD_name(prsactx->oaep_md)))
340 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
342 EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
345 if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
347 : EVP_MD_name(mgf1_md)))
351 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
352 if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label, 0))
355 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN);
356 if (p != NULL && !OSSL_PARAM_set_size_t(p, prsactx->oaep_labellen))
359 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
360 if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
363 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
364 if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
370 static const OSSL_PARAM known_gettable_ctx_params[] = {
371 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
372 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
373 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
374 OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
376 OSSL_PARAM_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN, NULL),
377 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
378 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
382 static const OSSL_PARAM *rsa_gettable_ctx_params(void)
384 return known_gettable_ctx_params;
387 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
389 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
391 char mdname[OSSL_MAX_NAME_SIZE];
392 char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
395 if (prsactx == NULL || params == NULL)
398 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
400 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
404 p = OSSL_PARAM_locate_const(params,
405 OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
407 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
411 EVP_MD_free(prsactx->oaep_md);
412 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
414 if (prsactx->oaep_md == NULL)
418 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
422 switch (p->data_type) {
423 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
424 if (!OSSL_PARAM_get_int(p, &pad_mode))
427 case OSSL_PARAM_UTF8_STRING:
434 for (i = 0; padding_item[i].id != 0; i++) {
435 if (strcmp(p->data, padding_item[i].ptr) == 0) {
436 pad_mode = padding_item[i].id;
447 * PSS padding is for signatures only so is not compatible with
448 * asymmetric cipher use.
450 if (pad_mode == RSA_PKCS1_PSS_PADDING)
452 if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
453 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
454 if (prsactx->oaep_md == NULL)
457 prsactx->pad_mode = pad_mode;
460 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
462 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
466 p = OSSL_PARAM_locate_const(params,
467 OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
469 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
475 EVP_MD_free(prsactx->mgf1_md);
476 prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
478 if (prsactx->mgf1_md == NULL)
482 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
484 void *tmp_label = NULL;
487 if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
489 OPENSSL_free(prsactx->oaep_label);
490 prsactx->oaep_label = (unsigned char *)tmp_label;
491 prsactx->oaep_labellen = tmp_labellen;
494 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
496 unsigned int client_version;
498 if (!OSSL_PARAM_get_uint(p, &client_version))
500 prsactx->client_version = client_version;
503 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
505 unsigned int alt_version;
507 if (!OSSL_PARAM_get_uint(p, &alt_version))
509 prsactx->alt_version = alt_version;
515 static const OSSL_PARAM known_settable_ctx_params[] = {
516 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
517 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
518 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
519 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
520 OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
521 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
522 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
526 static const OSSL_PARAM *rsa_settable_ctx_params(void)
528 return known_settable_ctx_params;
531 const OSSL_DISPATCH rsa_asym_cipher_functions[] = {
532 { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
533 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_init },
534 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
535 { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_init },
536 { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
537 { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
538 { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
539 { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
540 (void (*)(void))rsa_get_ctx_params },
541 { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
542 (void (*)(void))rsa_gettable_ctx_params },
543 { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
544 (void (*)(void))rsa_set_ctx_params },
545 { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
546 (void (*)(void))rsa_settable_ctx_params },